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为了进一步提高编码效率,提出了一种新的H.264中Pslices帧间快速自适应模式判决算法。在该算法中,SKIP模式无需经过拉格朗日率失真优化就可以判定为最佳模式;P8×8模式也可以在拉格朗日率失真优化之前从候选模式中排除。通过对以上两种特殊模式的判决,可以大大减少整个编码时间。仿真结果表明,和H.264参考软件JM10.2相比,该算法在整个编码时间上节省60%~80%的时间,而在PSNR和码率上的变化则可以忽略不计。
In order to further improve the coding efficiency, a new Pslices inter-frame fast adaptive mode decision algorithm in H.264 is proposed. In this algorithm, the SKIP mode can be judged as the best mode without Lagrange rate distortion optimization; the P8 × 8 mode can also be excluded from the candidate mode before the Lagrange rate distortion is optimized. Through the above two special mode of decision, can greatly reduce the entire coding time. Simulation results show that compared with H.264 reference software JM10.2, the proposed algorithm can save 60% ~ 80% of the total coding time while the change in PSNR and bit rate is negligible.